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<html>
<head>
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    <title>菜鸟教程(runoob.com)</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            border: 1px solid black;
            margin: 10px;
            float: left;
            padding: 30px;
            text-align: center;
            background-color: lightgray;
        }
        p {
            /*overflow: hidden;*/
            background-color: white;
        }
    </style>
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<h3>以下实例演示了 onmousemove, onmouseleave 和 onmouseout 的区别。</h3>
<p> onmousemove 事件在鼠标移动到 div 元素上时触发。</p>
<p> mouseleave 事件只在鼠标指针移出 div 元素时触发。 </p>
<p> onmouseout 事件在鼠标指针移出 div 元素及离开子元素（p 和 span）时触发。</p>

<div onmousemove="myMoveFunction()">
    <p>onmousemove: <br> <span id="demo">鼠标移入和移出！</span></p>
</div>
<div onmouseleave="myLeaveFunction()">
    <p>onmouseleave: <br> <span id="demo2">鼠标移入和移出！</span></p>
</div>
<div onmouseout="myOutFunction()">
    <p>onmouseout: <br> <span id="demo3">鼠标移入和移出！</span></p>
</div>
<script>
    x = 0;
    y = 0;
    z = 0;
    function myMoveFunction() {

        document.getElementById("demo").innerHTML  = z+=1;
    }
    function myLeaveFunction() {
        document.getElementById("demo2").innerHTML = x+=1;
    }
    function myOutFunction() {
        document.getElementById("demo3").innerHTML = y+=1;
    }
</script>

</body>
</html>